/* ============================================================
   SST GROUP — DESIGN SYSTEM
   Premium Industrial Solar Manufacturing Ecosystem
   ============================================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Outfit:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Brand Colors */
  --sst-orange: #FF6B00;
  --sst-orange-light: #FF8A33;
  --sst-orange-dark: #CC5500;
  --sst-orange-glow: rgba(255, 107, 0, 0.3);
  
  --sst-blue: #0A2463;
  --sst-blue-light: #1E3A7B;
  --sst-blue-dark: #061845;
  --sst-blue-glow: rgba(10, 36, 99, 0.4);
  
  /* Neutrals */
  --white: #FFFFFF;
  --off-white: #F8F9FC;
  --light-gray: #E8ECF4;
  --mid-gray: #94A3B8;
  --dark-gray: #475569;
  --charcoal: #1E293B;
  --deep-dark: #0F172A;
  --black: #020617;
  
  /* Metallic */
  --metallic-light: #E2E8F0;
  --metallic-mid: #94A3B8;
  --metallic-dark: #64748B;
  --steel: #334155;
  
  /* Gradients */
  --gradient-hero: linear-gradient(135deg, #0A2463 0%, #0F172A 40%, #1a0a00 100%);
  --gradient-orange: linear-gradient(135deg, #FF6B00, #FF8A33);
  --gradient-blue: linear-gradient(135deg, #0A2463, #1E3A7B);
  --gradient-dark: linear-gradient(180deg, #0F172A 0%, #020617 100%);
  --gradient-mesh: radial-gradient(ellipse at 20% 50%, rgba(255,107,0,0.08) 0%, transparent 50%),
                   radial-gradient(ellipse at 80% 20%, rgba(10,36,99,0.12) 0%, transparent 50%),
                   radial-gradient(ellipse at 50% 80%, rgba(255,107,0,0.05) 0%, transparent 50%);
  
  /* Glass */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-bg-light: rgba(255, 255, 255, 0.85);
  --glass-border-light: rgba(255, 255, 255, 0.5);
  
  /* Typography */
  --font-display: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  /* Font Sizes — Fluid */
  --text-xs: clamp(0.7rem, 0.6rem + 0.3vw, 0.8rem);
  --text-sm: clamp(0.8rem, 0.7rem + 0.3vw, 0.9rem);
  --text-base: clamp(0.9rem, 0.8rem + 0.4vw, 1rem);
  --text-lg: clamp(1rem, 0.9rem + 0.5vw, 1.2rem);
  --text-xl: clamp(1.2rem, 1rem + 0.6vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.2rem + 0.8vw, 2rem);
  --text-3xl: clamp(1.8rem, 1.4rem + 1.2vw, 2.5rem);
  --text-4xl: clamp(2.2rem, 1.6rem + 1.8vw, 3.5rem);
  --text-5xl: clamp(2.8rem, 2rem + 2.5vw, 4.5rem);
  --text-6xl: clamp(3.5rem, 2.5rem + 3.5vw, 6rem);
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
  
  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-2xl: 40px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.15);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.2);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.25);
  --shadow-glow-orange: 0 0 40px rgba(255,107,0,0.3);
  --shadow-glow-blue: 0 0 40px rgba(10,36,99,0.4);
  
  /* Transitions */
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --duration-fast: 200ms;
  --duration-normal: 350ms;
  --duration-slow: 600ms;
  
  /* Z-index */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal: 300;
  --z-overlay: 400;
  --z-toast: 500;
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--charcoal);
  background: var(--white);
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--duration-fast) var(--ease-smooth);
}

img, video {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
}

/* ---------- Selection ---------- */
::selection {
  background: var(--sst-orange);
  color: var(--white);
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--deep-dark); }
::-webkit-scrollbar-thumb {
  background: var(--sst-orange);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover { background: var(--sst-orange-light); }

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.container-wide {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.container-narrow {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ---------- Section ---------- */
.section {
  padding: var(--space-24) 0;
  position: relative;
}
.section--dark {
  background: var(--deep-dark);
  color: var(--white);
}
.section--gradient {
  background: var(--gradient-hero);
  color: var(--white);
}
.section--light {
  background: var(--off-white);
}

/* ---------- Section Headers ---------- */
.section-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--sst-orange);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.section-label::before {
  content: '';
  width: 30px;
  height: 2px;
  background: var(--sst-orange);
}

.section-title {
  font-size: var(--text-4xl);
  font-weight: 800;
  margin-bottom: var(--space-6);
  line-height: 1.1;
}
.section-title span {
  background: var(--gradient-orange);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--mid-gray);
  max-width: 680px;
  line-height: 1.8;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: 14px 32px;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.5px;
  border-radius: var(--radius-full);
  transition: all var(--duration-normal) var(--ease-smooth);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}
.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-smooth);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--gradient-orange);
  color: var(--white);
  box-shadow: 0 4px 20px rgba(255,107,0,0.35);
}
.btn--primary:hover {
  box-shadow: 0 8px 32px rgba(255,107,0,0.5);
}

.btn--secondary {
  background: transparent;
  color: var(--white);
  border: 1.5px solid rgba(255,255,255,0.3);
  backdrop-filter: blur(10px);
}
.btn--secondary:hover {
  border-color: var(--sst-orange);
  background: rgba(255,107,0,0.1);
}

.btn--outline {
  background: transparent;
  color: var(--sst-orange);
  border: 1.5px solid var(--sst-orange);
}
.btn--outline:hover {
  background: var(--sst-orange);
  color: var(--white);
}

.btn--dark {
  background: var(--deep-dark);
  color: var(--white);
}
.btn--dark:hover {
  background: var(--charcoal);
}

.btn--lg {
  padding: 18px 42px;
  font-size: var(--text-base);
}
.btn--sm {
  padding: 10px 22px;
  font-size: var(--text-xs);
}

.btn--icon {
  width: 48px;
  height: 48px;
  padding: 0;
  border-radius: 50%;
}

/* ---------- Glass Card ---------- */
.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: var(--space-8);
  transition: all var(--duration-normal) var(--ease-smooth);
}
.glass-card:hover {
  border-color: rgba(255,107,0,0.2);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.glass-card-light {
  background: var(--glass-bg-light);
  border: 1px solid var(--glass-border-light);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
  transition: all var(--duration-normal) var(--ease-smooth);
}
.glass-card-light:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

/* ---------- Badge ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
}
.badge--orange {
  background: rgba(255,107,0,0.15);
  color: var(--sst-orange);
}
.badge--blue {
  background: rgba(10,36,99,0.15);
  color: var(--sst-blue);
}

/* ---------- Grid ---------- */
.grid {
  display: grid;
  gap: var(--space-8);
}
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .grid--4,
  .grid--3,
  .grid--2 { grid-template-columns: 1fr; }
}

/* ---------- Animations ---------- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInLeft {
  from { opacity: 0; transform: translateX(-40px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes fadeInRight {
  from { opacity: 0; transform: translateX(40px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}
@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-12px); }
}
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(255,107,0,0.3); }
  50% { box-shadow: 0 0 40px rgba(255,107,0,0.6); }
}
@keyframes rotate-slow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
@keyframes count-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}
@keyframes grain {
  0%, 100% { transform: translate(0, 0); }
  10% { transform: translate(-5%, -10%); }
  30% { transform: translate(3%, -15%); }
  50% { transform: translate(12%, 9%); }
  70% { transform: translate(9%, 4%); }
  90% { transform: translate(-1%, 7%); }
}

/* Scroll-triggered animation classes */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.8s var(--ease-smooth);
}
.reveal.active {
  opacity: 1;
  transform: translateY(0);
}
.reveal-left {
  opacity: 0;
  transform: translateX(-60px);
  transition: all 0.8s var(--ease-smooth);
}
.reveal-left.active {
  opacity: 1;
  transform: translateX(0);
}
.reveal-right {
  opacity: 0;
  transform: translateX(60px);
  transition: all 0.8s var(--ease-smooth);
}
.reveal-right.active {
  opacity: 1;
  transform: translateX(0);
}
.reveal-scale {
  opacity: 0;
  transform: scale(0.85);
  transition: all 0.8s var(--ease-smooth);
}
.reveal-scale.active {
  opacity: 1;
  transform: scale(1);
}

/* Stagger delays */
.delay-1 { transition-delay: 0.1s !important; }
.delay-2 { transition-delay: 0.2s !important; }
.delay-3 { transition-delay: 0.3s !important; }
.delay-4 { transition-delay: 0.4s !important; }
.delay-5 { transition-delay: 0.5s !important; }
.delay-6 { transition-delay: 0.6s !important; }

/* ---------- Text Utilities ---------- */
.text-center { text-align: center; }
.text-orange { color: var(--sst-orange); }
.text-blue { color: var(--sst-blue); }
.text-white { color: var(--white); }
.text-gray { color: var(--mid-gray); }
.text-gradient {
  background: var(--gradient-orange);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.font-display { font-family: var(--font-display); }
.font-mono { font-family: var(--font-mono); }
.uppercase { text-transform: uppercase; }
.tracking-wide { letter-spacing: 2px; }

/* ---------- Divider ---------- */
.divider {
  width: 80px;
  height: 3px;
  background: var(--gradient-orange);
  border-radius: var(--radius-full);
  margin: var(--space-6) 0;
}
.divider--center { margin: var(--space-6) auto; }

/* ---------- Particles / Decorative ---------- */
.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.bg-noise {
  position: absolute;
  inset: 0;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  pointer-events: none;
}

.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  opacity: 0.4;
}
.glow-orb--orange {
  background: var(--sst-orange);
}
.glow-orb--blue {
  background: var(--sst-blue);
}

/* ---------- Responsive Typography Helpers ---------- */
@media (max-width: 768px) {
  .section { padding: var(--space-16) 0; }
  .container { padding: 0 var(--space-4); }
}